I want to create noisy websites. All of our desktop applications make sounds. It seems completely unfair that our websites are so quiet.

For example, when you empty your computer's recycle bin your computer makes the satisfying sound of trash being dumped from a trash can. When you leave the desktop and enter the web, however, the world goes silent (almost like you are under water).

When you browse a catalog of products displayed on a website, each product should demand to be bought. When you hover your mouse over a picture of a music box, it should play a quiet tune. When you hover your mouse over a picture of a vacuum cleaner, it
should make a mighty rrrrrrrrrrrrr sound.

Whenever I reveal my secret ambition to make noisy websites, people always groan. Everyone always thinks of all of those MySpace pages with the endlessly looping background music. But I don't mean background music, I mean noise.

We interact with websites through metaphors. We work with “files” and “folders” on a “desktop”. We grab files and “drag” them to new folders. Under the covers, of course, we are really just flipping massive numbers of bits. But, we understand our complex
interactions with our computers by projecting metaphors that we've stolen from the physical world onto our machines.

The more closely our software interactions match our metaphors, the more satisfying the experience becomes. Dropping a file in a recycle bin to delete it makes perfect sense. If the recycle bin looks like a prototypical recycle bin, the experience seems
more real. If the trash makes a satisfying trash-being-emptied sound, the experience is even more real.

In this month's post, I'm going to tackle the problem of adding sounds to your ASP.NET websites. The goal is to produce sounds dynamically using Javascript.

Methods of Making Sounds

Let's start with a quick review of the methods of generating sounds in a web page. There are three tags that you can add to a page to generate a sound: the <bgsound> tag, the <embed> tag, and the <object> tag.

Here's how you add sound with the <bgsound> tag:

<bgsound src="test.wav" />

The <bgsound> tag is the tag that gave sound a bad name. This is the tag that everyone adds to their websites to create the endlessly looping background music.

The <bgsound> tag was introduced into the world (in the same month) with the release of Microsoft Internet Explorer 2.0 and Mosaic 2.1. Opera supports the <bgsound> tag, but Firefox does not.

Since the <bgsound> was never incorporated into any web standards (you won't find any mention of the tag in either the HTML or XHTML standards), most web authors avoid this tag as outdated and dead. Typically, you are encouraged not to use the <bgsound>
tag in favor of either the <embed> or <object> tag.

However, I use the <bgsound> sound tag in the Javascript that I develop at the end of this post. There is one very important advantage of the <bgsound> tag. The <bgsound> tag does not cause the information bar to popup in Internet Explorer when you use this
tag in a page.

The Internet Explorer version of this tag has four important properties:

Balance -- Enables you to specify the balance between the left and right speaker

Loop -- Enables you to specify the number of times that the sound will repeat. The value -1 means loop infinitely

Src -- Enables you to specify the URL to the sound file

Volume -- Enables you to specify the volume of the sound (valid values range from -10,000 to 0)

As an alternative to the <bgsound> tag, you can use the <embed> tag. The <embed> tag was introduced to the world with the release of Netscape 1.1. The tag is now supported by all modern browsers.

Here's how you use the <embed> tag:

<embed src="test.wav" type=”audio/x-wav” />

The src attribute points to the sound file and the type attribute specifies the MIME type of the file. Notice that the MIME type of a .wav sound file is indicated with the MIME type audio/x-wav. The x means that .wav is a custom type. Using the x is necessary
because the .wav sound file format does not have a registered MIME type at IANA.

The <embed> tag is not limited to sounds. You can use the <embed> tag to embed a variety of different types of objects in a page including videos and pictures.

There's no master list of valid attributes for the <embed> tag. Different types of objects that you embed in a document will support different attributes. For example, on my computer, Windows Media Player is mapped to the .wav extension. Therefore, I can
use Windows Media Player attributes with the <embed> tag.

One problem with using the <embed> tag is that you must have an application mapped to the type of file being downloaded. Unfortunately, on my computer, there was no application mapped to the .wav extension by default. When I initially requested a page that
contained an embedded .wav file, I got the Internet Explorer information bar.

Since I don't want to inflict the Internet Explorer information bar on users when playing sounds, I don't use the <embed> tag in the Javascript at the end of this article. The <bgsound> element enables us to play .wav files without displaying the information
bar.

The final -- and generally recommended -- method of adding sound to a web page is to use the <object> tag. The <object> tag is very similar to the <embed> tag. It allows you to embed objects in a page like this:

<object data="test.wav" type="audio/x-wav" />

Notice that the <object> tag uses the data attribute and not the src attribute to point to a file.

The difference between the <embed> tag and the <object> tag is that the latter tag is supported by W3C web standards. If creating standards compliant websites is important to you, then you should use this tag.

Just like in the case of the <embed> tag, there is no master list of attributes for the <object> tag. The list of valid attributes all depends on the application or plug-in being used to display the embedded object.

Unfortunately, when used with Internet Explorer, the <object> tag causes the Internet Explorer information bar to popup just like the <embed> tag. In the Javascript at the end of this article, I use the <bgsound> tag for Internet Explorer and the <object>
tag for every other browser.

Generating Sounds with Javascript

So now that we've finished reviewing the possible methods of generating sound in a page, we are ready to create our Javascript that we'll use in our ASP.NET pages to generate sound. Our script will works with recent versions of all major browsers including
Internet Explorer, Firefox, and Opera.

Since the script is small, the entire content of the PlaySound.js Javascript file is included right here:

The first lines of the Javascript create an event handler for the browser window load event. Internet Explorer uses the attachEvent() method to create an event handler and other browsers use the addEventListener() method.

The setupPlaySounds() method is called after the window is loaded. This method creates the playSound() method. Javascript enables you to conditionally create different versions of a function. There is one version of the playSound() method that is created
in the case of Internet Explorer and another version that is created in the case of every other browser.

The Internet Explorer version of the playSound() method takes advantage of the <bgsound> tag to play a sound. The alternative playSound() method takes advantage of the <object> tag.

If you link the Javascript file above into an ASP.NET page, then you can play a sound by calling the playSound() method and passing the URL of a sound file. You can link the PlaySound.js file to an ASP.NET page by adding the following tag to the page:

<script type="text/javascript" src="PlaySound.js"></script>

And, adding the following link to a page will cause the sound file ClickHere.wav to play whenever you hover your mouse over the link.

The playSound() method works with recent versions of Internet Explorer, Firefox, and Opera.

I did run into one issue when testing this method with Firefox. Firefox uses the Apple QuickTime plug-in to play sound files. However, on my computer, QuickTime was not mapped to .wav files. I fixed this problem by launching the QuickTime Player, and selecting
the menu option Edit, Preferences, QuickTime Preferences and selecting the File Types tab. Under this tab, I was able to associate .wav files with the QuickTime Player.

Conclusion

I think the web would be a much more enjoyable place if it were only a little louder. In this post, I've provided you with a cross-browser compatible Javascript playSound() method that you can use in your ASP.NET pages to add sound. Please make some noise.

Surely network latency is an issue here? If I click the "empty trash" button the trash-emptying sound needs to play straight away, not after the delay caused by the browser requesting and receiving the audio file from the server (and then figuring out how to play it).

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